Hello peoples... I have a yzf600 which has started it's service, I have found a heap of sand in the airbox, which has gotten past the filter ( filter mustn't have been sitting properly), whaich has got me thinking worst case scenario, I might have to do a rebuild on the engine sometime soon. So of course the next question is, where can you get a kit to up the capacity of the engine, and how much? I have had a bit of a google search, nothing has come up. Any ideas? If I am going to do the engine, I may as well see If I can improve a bit on what is there already. Thanks, Ian